Bosch GLL 2-50 Professional Manual Original página 16

OBJ_BUCH-817-005.book Page 16 Tuesday, May 6, 2014 10:15 AM
16 | English
Checking the Levelling Accuracy of the Horizontal Line
For the check, a free surface of approx. 5 x 5 metres is required.
– Set up the measuring tool on a firm, level surface between
both walls A and B. Allow the measuring tool to level in
while in horizontal operation.
A
– At a distance of 2.5 metres from the measuring tool, mark
the centre of the laser line (point I on wall A and point II on
wall B) on both walls.
A
– Set up the measuring tool 5 metres away turned by 180°
and allow it to level in.
– Align the height of the measuring tool (using a tripod or by
underlaying, if required) in such a manner that the centre
of the laser line is projected exactly against the previously
marked point II on wall B.
– Mark the centre of the laser line as point III (vertically
above or below point I) on the wall A.
– The difference d of both marked points I and III on wall A
indicates the actual deviation of the measuring tool from
the level plane.
The maximum permitted deviation d
lows:
d = double distance of the walls x 0.3 mm/m
max
Example: With a 5 metre distance between the walls, the max-
imum deviation must not exceed
d = 2 x 5 m x 0.3 mm/m = 3 mm. Thus, the marks must not
max
be more than 3 mm apart.
1 609 92A 0KJ | (6.5.14)
Checking the Levelling Accuracy of the Vertical Line
For this check, a door opening is required with at least 2.5 m
of space (on a firm surface) to each side of the door.
B
– Position the measuring tool on a firm, level surface (not on
B
– Mark the centre of the vertical laser line at the floor of the
– Position the measuring tool on the other side of the door
– The difference d between point III and the centre of the la-
is calculated as fol-
max
– Measure the height of the door opening.
The maximum permitted deviation d
lows:
d
Example: With a door opening height of 2 metres, the maxi-
mum permitted deviation is
d
not be more than 1.2 mm apart.
a tripod) 2.5 m away from the door opening. Allow the
measuring tool to level in while in cross-line operation
mode, and direct the laser beams at the door opening.
door opening (point I), at a distance of 5 m beyond the
other side of the door opening (point II) and at the upper
edge of the door opening (point III).
opening directly behind point II. Allow the measuring tool
to level in and align the vertical laser line in such a manner
that its centre runs exactly through points I and II.
ser line at the upper edge of the door opening results in the
actual deviation of the measuring tool from the vertical
plane.
= double height of the door opening x 0.3 mm/m
max
= 2 x 2 m x 0.3 mm/m = 1.2 mm. Thus, the marks must
max
is calculated as fol-
max
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